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6CCVD Research

Enamel and Dentin Microhardness and Chemical Composition After Experimental Light-activated Bleaching

At a Glance

Section titled ā€œAt a Glanceā€
MetadataDetails
Publication Date2015-03-06
JournalOperative Dentistry
AuthorsEva Klarić, Mario Rakić, Ivan Sever, O. Milat, Matej Par
InstitutionsInstitute for Tourism, Institute of Physics
Citations66

Abstract

Section titled ā€œAbstractā€

SUMMARY Objectives To evaluate 1) the influence of five bleaching agents (with additional light activation) on enamel and dentin surface microhardness and chemical composition and 2) the remineralizing potential of artificial saliva and amorphous calcium phosphate (ACP). Methods and Materials The study was conducted on 125 human third molars dissected into quarters for separate enamel and dentin measurements. The bleaching process was performed with 38% and 25% hydrogen peroxide (HP) and 30%, 16%, and 10% carbamide peroxide (CP) gels two times for 15 minutes each time. All bleaching gels were tested alone and in combination with ZOOM2, light-emitting diode (LED), organic LED, and femtosecond laser. A total of 25 bleaching combinations (n=10) were evaluated. Microhardness was measured by a Vickers diamond. Chemical analysis was performed using energy-dispersive X-ray spectroscopy. Results Bleaching agents used in the absence of light activation caused a significant reduction in enamel and dentin surface microhardness (p<0.001), ranging from 8% for 16% CP to 40% for 25% HP. The effects of different light activations were negligible. After two-week treatment with ACP and artificial saliva, maximum deviation from baseline microhardness was just 3%. Such treatment increased the concentrations of calcium, phosphorus, and fluorine. Conclusions An increase in peroxide concentration and gel acidity negatively affected microhardness and concentrations of calcium and phosphorus in enamel and dentin. ACP and artificial saliva stimulated the remineralization of hard tissues.

Tech Support

Section titled ā€œTech Supportā€

Original Source

Section titled ā€œOriginal Sourceā€

References

Section titled ā€œReferencesā€
  1. 2005 - Subsurface microhardness of enamel and dentin after different external bleaching procedures
  2. 2012 - Microhardness change of enamel due to bleaching with in-office bleaching gels of different acidity [Crossref]
  3. 2011 - Effect of carbamide peroxide and hydrogen peroxide on enamel surface: An in vitro study [Crossref]
  4. 2011 - Postoperative sensitivity after two in-office bleaching methods
  5. 2001 - Effect of 10% carbamide peroxide bleaching materials on enamel microhardness
  6. 2009 - Effect of different bleaching systems on the ultrastructure of bovine dentin [Crossref]
  7. 2004 - Pulp reaction to vital bleaching
  8. 2008 - Effect of fluoride containing bleaching agents on enamel surface properties [Crossref]
  9. 2008 - Remineralization of enamel subsurface lesions in situ by the use of three commercially available sugar-free gums [Crossref]

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